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People generally claim that complicated syndromes (Jia Zheng) and concurrent syndromes (Jian Zheng) are difficult to treat, but I, Lei Feng, assert that they are not difficult at all. What constitutes a complicated syndrome? For instance, contracting wind pathogen results in Wind-Cold injury (Shang Feng), for which formulas such as Guizhi Tang (Cinnamon Twig Decoction) are appropriate; contracting cold pathogen results in Cold Damage (Shang Han), for which formulas such as Mahuang Tang (Ephedra Decoction) are appropriate. If both wind and cold pathogens are contracted simultaneously, it is termed a complicated syndrome. Since wind pathogen requires dispersing methods and cold pathogen requires warming methods, the representative formula for warming and dispersing is Guizhi Mahuang Gemi Tang (Half-Guizhi Half-Mahuang Decoction). If summerheat pathogen is complicated with dampness, dampness requires draining methods while summerheat requires clearing methods; the representative formula for clearing and draining is Tianshui San (Tianshui Powder). If dryness qi is complicated with fire, fire requires cooling methods while dryness requires moistening methods; the representative formula for cooling and moistening is Qingzao Jiufei Tang (Clear Dryness Rescue Lung Decoction). The remaining combinations, such as wind-summerheat, wind-dampness, wind-dryness, and wind-fire, all belong to complicated syndromes, and their treatment methods can be modeled on this principle. How then should concurrent syndromes be handled? For example, in young adults presenting with spermatorrhea, one must distinguish whether dreams are present or absent. If dreams are present, formulas such as Kanli Jiji Tang (Kanli Jiji Decoction) are appropriate; if absent, formulas such as Jin Suo Gu Jing Wan (Golden Lock Essence-Securing Pill) are appropriate. This is a fixed method. However, if triggered by damp-heat pathogen, it becomes a concurrent syndrome. Draining dampness may injure Yin, while nourishing Yin may stagnate dampness. To drain dampness without injuring Yin, one may use Zhuling Tang (Polyporus Decoction) or Liuwei Dihuang Wan (Six-Ingredient Rehmannia Pill); if dampness pathogen is severe, one should first treat the dampness, and only after the dampness is resolved should essence-astringent methods be employed. Similarly, for elderly patients with deficiency damage, one must distinguish the depth of the syndrome. For shallow conditions, formulas such as Liujunzi Tang (Six Gentlemen Decoction) or Siwu Tang (Four Substance Decoction) are appropriate; for deep conditions, formulas such as Guben Wan (Root-Fixing Pill) or Dazao Wan (Great Creation Pill) are appropriate. This is also a fixed method. If invaded by wind pathogen, it becomes a concurrent syndrome. Dispersing wind further depletes healthy Qi, while tonifying healthy Qi inevitably traps the pathogen. To disperse pathogen without damaging healthy Qi, one may use Shensu Yin (Ginseng and Perilla Infusion) or Buzhong Yiqi Tang (Tonify the Middle and Augment the Qi Decoction); if wind pathogen is severe, one should first disperse the wind, and only after the wind pathogen is resolved should tonification for deficiency be performed. Regarding women whose menstruation is due, one must examine whether it arrives early or late. Early arrival indicates blood heat, treated with Danpi and Gardenia combined with Siwu Tang (Four Substance Decoction); late arrival indicates blood cold, treated with Xiangfu and Amomum combined with Siwu Tang. This is a fixed method. If triggered by cold pathogen, it becomes a concurrent syndrome. One should consult formulas that can dispel cold and regulate menstruation, such as Xiangsu Yin (Perilla and Cyperus Infusion); if cold pathogen is excessive, one must first dispel the cold, and then regulate menstruation. For postpartum fever in women, one must differentiate between deficiency and excess syndromes. Deficiency requires tonification, such as Jiawei Siwu Tang (Modified Four Substance Decoction); excess requires breaking stasis, such as Shenghua Tang (Generation of Blood Decoction) or Shixiao San (Instantly Effective Powder). This is a fixed method. If affected by summerheat pathogen, it becomes a concurrent syndrome. One should consult formulas that can clear summerheat and treat postpartum conditions, such as Zhupi Dawan (Bark Large Pill); if summerheat is excessive, one must first clear the summerheat, and then treat the postpartum condition. If a physician can apply such flexible adaptation, what difficulty could there possibly be in treating complicated and concurrent syndromes!